Hasn't happened to me much as far as I know, but very likely it's happened behind my back sometimes. It was very common in my workplace. I guess I was lucky that there were always individuals around who were stranger than I am, so I wasn't the one obvious target.
Nearest thing I can remember is years ago when I was with some friends. The conversation moved from idea to idea too quickly for my Aspie brain, so I'd get stuck on one of the ideas and go quiet, and much later, after they'd moved on from it, I'd chip in with a comment about that idea. This frustrated and amused them, and their NT leader likened me to a character in a TV soap opera, an old woman who apparently did that because of senility. But it came over very benignly, and I didn't feel hurt. I know one guy these days who keeps having a dig at me for random things, but the others don't seem to rise to the occasion. First time or two, I just felt embarrassed and ignored his comment, after that I managed a quick reply that turned the joke back onto him, but I don't know I'll be so lucky again.
I don't think it always means that the group / person dislikes you. Some groups of NTs enjoy "insulting" each other, and for them it's a sign that they want to play, it's a way of getting closer. It seems silly. I think I understand why it works for them, but it would be a long explanation.
If you don't understand the procedures behind their "in-jokes," it's hard to act appropriately. I think it's helpful to be able to fake a short, loud-ish laugh. It tells them you've picked up the general purpose of their strange behaviour, it discharges a bit of tension, and it tells them you're not feeling intimidated.
If you basically don't like them, it's very hard to fit in. I've been stuck in groups of people I mostly disliked. I found myself eventually learning to fake a bit of warmth, though I never liked myself for doing it and was quite economical with it, didn't want it to spill over into being sycophantic. The first group were often pretty horrible people. Later on the people were generally better, though still not often what I'd call friend material. It was then easier to "fake" the warmth. I'd also mellowed with age and didn't see it as so beneath me to try to be friendly to somebody who had done one or two things I disapproved of, so the faking became more genuine. But I always had a feeling of not really being a part of it all, just surviving in spite of them and sharing very little about myself.